[PATCH] ieee1394: sbp2: fix race condition in state change

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

An intermediate transition from _RUNNING to _IN_SHUTDOWN could have been
missed by the former code.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
 drivers/ieee1394/sbp2.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Index: linux/drivers/ieee1394/sbp2.c
===================================================================
--- linux.orig/drivers/ieee1394/sbp2.c
+++ linux/drivers/ieee1394/sbp2.c
@@ -895,12 +895,13 @@ static void sbp2_host_reset(struct hpsb_
 		return;
 
 	read_lock_irqsave(&sbp2_hi_logical_units_lock, flags);
+
 	list_for_each_entry(lu, &hi->logical_units, lu_list)
-		if (likely(atomic_read(&lu->state) !=
-			   SBP2LU_STATE_IN_SHUTDOWN)) {
-			atomic_set(&lu->state, SBP2LU_STATE_IN_RESET);
+		if (atomic_cmpxchg(&lu->state,
+				   SBP2LU_STATE_RUNNING, SBP2LU_STATE_IN_RESET)
+		    == SBP2LU_STATE_RUNNING)
 			scsi_block_requests(lu->shost);
-		}
+
 	read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags);
 }
 

-- 
Stefan Richter
-=====-==--- =-== ===-=
http://arcgraph.de/sr/